@charset "utf-8";
.mid{
    height: 180vh;
    width: 100vw;
    display: flex;
    flex-direction: column;
}

.headimg{
    top: 0px;
    height: 250px;
    width: 100%;
    background-image: url("../image/headimg2.jpg");
    background-size: 1540px;
    background-repeat: no-repeat;
    background-position-y: -190px;
    background-position-x: -150px;
    overflow: hidden;
    border-bottom: 5px solid rgb(58, 83, 85);
    animation: headload 0.9s linear;
}
.headimg h1{
    color: rgb(92, 136, 177);
    font-size: 5em;
    text-align: center;
    line-height: 200px;
}

.mid .ab{
    width: 800px;
    height: 300px;
    box-shadow: 0 0 15px rgb(83, 103, 110);
    background: rgba(71, 142, 175, 0.2);
    border-radius: 15px;
    backdrop-filter: blur(5px);
    display: flex;
    overflow: hidden;
    margin-top: 40px;
}
.a1 .img{
    background-image: url("../image/about1.jpg");
}
.a2 .img{
    background-image: url("../image/about2.jpg");
}
.a3 .img{
    background-image: url("../image/about3.jpg");
}

.ab p{
    word-wrap: break-word;
    color: rgb(41, 68, 68);
    line-height: 24px;
}

.ab .txt{
    width: 400px;
    margin: 0 50px 0 50px;
}
.ab h2{
    text-align: center;
    color: rgb(51, 86, 114);
}
.ab .img{
    width: 300px;
    height: 100%;
    background-size: cover;
    background-position: center;
    filter: grayscale(0.3);
    opacity: 0.8;
    transition: all 0.5s ease 0s;
}
.ab .img:hover{
    transform: scale(1.1);
}
.ab .imghid{
    overflow: hidden;
}
.a1{
    margin-left: 40%;
    animation: a1load 2.5s linear;
    transition: 0.5s  1s;
}
.a2{
    margin-left: 10%;
    animation: a2load 3.6s linear;
    transition: 0.5s;
}
.a3{
    margin-left: 40%;
    animation: a3load 4.8s linear;
    transition: 0.5s;
}
.a3 h2{
    margin-top: 100px;
    line-height: 50px;
}

@keyframes a1load{
    0%{
        opacity: 0;
    }
    70%{
        opacity: 0;
        margin-top: 100px;
    }
    100%{
        opacity: 1;
        margin-top: 40px;
    }
}
@keyframes a2load{
    0%{
        
        opacity: 0;
    }
    80%{
        opacity: 0;
        margin-top: 100px;
    }
    100%{
        opacity: 1;
    }
}
@keyframes a3load{
    0%{
        
        opacity: 0;
    }
    90%{
        opacity: 0;
        margin-top: 100px;
    }
    100%{
        opacity: 1;
    }
}
@keyframes headload{
    0%{
        height: 0px;
    }
    100%{
        height: 240px;
    }
}